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JP7435369B2 - photocatalyst - Google Patents
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JP7435369B2 - photocatalyst - Google Patents

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JP7435369B2
JP7435369B2 JP2020146554A JP2020146554A JP7435369B2 JP 7435369 B2 JP7435369 B2 JP 7435369B2 JP 2020146554 A JP2020146554 A JP 2020146554A JP 2020146554 A JP2020146554 A JP 2020146554A JP 7435369 B2 JP7435369 B2 JP 7435369B2
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photocatalyst
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秀明 新見
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Murata Manufacturing Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、光触媒に関する。 The present invention relates to a photocatalyst.

近年、光エネルギーを用いて水を分解し、水素を得るために用いられる光触媒の研究が進められている。光触媒は、より多くの水素を得るために、水の分解活性が高いことが好ましい。 In recent years, research has been progressing on photocatalysts that are used to decompose water using light energy and obtain hydrogen. The photocatalyst preferably has high water decomposition activity in order to obtain more hydrogen.

特許文献１には、希土類元素、アルカリ土類金属元素、チタン族元素のうちのいずれかの元素を組み込んだチタン酸バリウム塩に、助触媒として酸化ルテニウム、酸化イリジウムまたは酸化タンタルの単独酸化物、または、少なくとも二種類の酸化物の混合物を担持させた光触媒が記載されている。 Patent Document 1 discloses that a barium titanate salt incorporating any one of rare earth elements, alkaline earth metal elements, and titanium group elements contains a single oxide of ruthenium oxide, iridium oxide, or tantalum oxide as a cocatalyst, Alternatively, a photocatalyst in which a mixture of at least two types of oxides is supported is described.

特開平７－８８３７０号公報Japanese Patent Application Publication No. 7-88370

しかしながら、特許文献１に記載の光触媒は、酸化ルテニウムや酸化イリジウムなどの希少金属を使用するものであるため、コストがかかるとともに、環境保全の観点から好ましくない。 However, since the photocatalyst described in Patent Document 1 uses rare metals such as ruthenium oxide and iridium oxide, it is costly and unfavorable from the viewpoint of environmental conservation.

本発明は、上記課題を解決するものであり、希少金属を使用することなく、水の分解活性が高い光触媒を提供することを目的とする。 The present invention solves the above problems, and aims to provide a photocatalyst with high water decomposition activity without using rare metals.

本発明の光触媒は、
ＴｉＯ2を含む粒子にＣｒＮｉ酸化物が担持されており、
前記ＣｒＮｉ酸化物に含まれるＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）は、０．４以上１．０未満であることを特徴とする。 The photocatalyst of the present invention is
CrNi oxide is supported on particles containing TiO 2 ,
The CrNi oxide is characterized in that the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni contained in the CrNi oxide is 0.4 or more and less than 1.0.

また、本発明の別の態様による光触媒は、ＢａＴｉ4Ｏ9を含む粒子にＣｒＮｉ酸化物が担持されていることを特徴とする。 Further, a photocatalyst according to another aspect of the present invention is characterized in that CrNi oxide is supported on particles containing BaTi 4 O 9 .

本発明の光触媒は、希少金属が含まれていないが、活性が高い。したがって、水の分解により、より多くの水素を発生させることができる。 Although the photocatalyst of the present invention does not contain rare metals, it has high activity. Therefore, more hydrogen can be generated by water decomposition.

第１の実施形態における光触媒の構造を模式的に示す図である。FIG. 2 is a diagram schematically showing the structure of a photocatalyst in the first embodiment. 光触媒の活性を評価するために用いた装置の構成を模式的に示す図である。FIG. 2 is a diagram schematically showing the configuration of an apparatus used to evaluate the activity of a photocatalyst. 第１の実施形態における光触媒の助触媒であるＣｒＮｉ酸化物に含まれるＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）と、水素の発生量との関係を示す図である。FIG. 2 is a diagram showing the relationship between the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni contained in the CrNi oxide that is a promoter of the photocatalyst in the first embodiment, and the amount of hydrogen generated. be. 第２の実施形態における光触媒の構造を模式的に示す図である。FIG. 3 is a diagram schematically showing the structure of a photocatalyst in a second embodiment. 第２の実施形態における光触媒の助触媒であるＣｒＮｉ酸化物に含まれるＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）と、水素の発生量との関係を示す図である。FIG. 2 is a diagram showing the relationship between the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni contained in the CrNi oxide that is a promoter of the photocatalyst in the second embodiment, and the amount of hydrogen generated. be.

本発明による光触媒は、チタン酸化物にＣｒＮｉ酸化物を助触媒として担持させた構造を有し、希少金属を含まない。以下に本発明の実施形態を示して、本発明の特徴を具体的に説明する。 The photocatalyst according to the present invention has a structure in which CrNi oxide is supported as a promoter on titanium oxide, and does not contain rare metals. Embodiments of the present invention will be shown below, and features of the present invention will be specifically explained.

＜第１の実施形態＞
図１は、第１の実施形態における光触媒１０の構造を模式的に示す図である。第１の実施形態における光触媒１０は、ＴｉＯ2を含む粒子１１に、助触媒としてＣｒＮｉ酸化物１２が担持された構造を有する。ＣｒＮｉ酸化物１２に含まれるＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）は、０．４以上１．０未満である。 <First embodiment>
FIG. 1 is a diagram schematically showing the structure of a photocatalyst 10 in a first embodiment. The photocatalyst 10 in the first embodiment has a structure in which CrNi oxide 12 is supported as a promoter on particles 11 containing TiO 2 . The ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni contained in the CrNi oxide 12 is 0.4 or more and less than 1.0.

チタン酸化物であるＴｉＯ2を含む粒子１１は、ＴｉＯ2を主成分として含む粒子であって、例えば、ＴｉＯ2からなる粒子である。なお、ＴｉＯ2を主成分として含むとは、５０％以上の成分がＴｉＯ2であることを意味し、ＴｉＯ2以外の成分が含まれていてもよい。 The particles 11 containing TiO 2 which is a titanium oxide are particles containing TiO 2 as a main component, and are, for example, particles made of TiO 2 . Note that "containing TiO2 as a main component" means that 50% or more of the component is TiO2 , and components other than TiO2 may be included.

助触媒であるＣｒＮｉ酸化物１２は、ＣｒとＮｉが主成分の酸化物である。 The CrNi oxide 12, which is a promoter, is an oxide whose main components are Cr and Ni.

（実施例１）
硝酸Ｎｉ水溶液および硝酸Ｃｒ水溶液を所望の組成比および量で配合した水溶液に、ＴｉＯ2の原料粉を浸漬して攪拌した後、１５０℃に設定したホットプレートで加熱して乾燥物を得た。その後、乾燥物を、大気中５００℃で熱処理することによって硝酸を揮発させてＣｒＮｉ酸化物を結晶化させることにより、ＴｉＯ2に、助触媒であるＣｒＮｉ酸化物が担持した光触媒の粉体を作製した。 (Example 1)
TiO 2 raw material powder was immersed and stirred in an aqueous solution containing a Ni nitrate aqueous solution and a Cr nitrate aqueous solution in the desired composition ratio and amount, and then heated on a hot plate set at 150 ° C. to obtain a dried product. Thereafter, the dried material was heat-treated at 500°C in the atmosphere to volatilize the nitric acid and crystallize the CrNi oxide, thereby producing a photocatalyst powder in which CrNi oxide, which is a co-catalyst, was supported on TiO 2 . did.

作製した光触媒の活性を、以下の方法により評価した。 The activity of the produced photocatalyst was evaluated by the following method.

図２は、光触媒の活性を評価するために用いた装置の構成を模式的に示す図である。シャーレ２１に、作製した光触媒の粉体０．３ｇと純水１ｇを混合して得られるスラリーを入れた。そして、そのシャーレ２１を密封容器２２内に入れた後、石英ガラスからなる蓋２３をして密封した。なお、石英ガラスからなる蓋２３は、紫外線を透過させる。 FIG. 2 is a diagram schematically showing the configuration of an apparatus used to evaluate the activity of a photocatalyst. A slurry obtained by mixing 0.3 g of the prepared photocatalyst powder and 1 g of pure water was placed in a petri dish 21. Then, after putting the Petri dish 21 into a sealed container 22, the container was sealed with a lid 23 made of quartz glass. Note that the lid 23 made of quartz glass transmits ultraviolet rays.

続いて、１リットルのアルゴンガスを満たしたパック２４から、送風ポンプ２５を用いて、アルゴンガスを送出させて、１ｃｃ／分の量のアルゴンガスを循環させた。すなわち、パック２４内のアルゴンガスを、密封容器２２内を通過して、再びパック２４内へと戻るように循環させた。なお、アルゴンガスは、水の分解により発生した水素が酸素等と反応することを抑制するために、密封容器２２内に導入させた。 Subsequently, the air pump 25 was used to send out argon gas from the pack 24 filled with 1 liter of argon gas, thereby circulating the argon gas at a rate of 1 cc/min. That is, the argon gas in the pack 24 was circulated through the sealed container 22 and back into the pack 24. Note that argon gas was introduced into the sealed container 22 in order to suppress hydrogen generated by water decomposition from reacting with oxygen and the like.

続いて、石英ガラスからなる蓋２３を介して、シャーレ２１内のスラリーに紫外線を照射した。スラリーに紫外線を照射することによって水の分解が生じ、水素が発生する。この状態を１時間継続し、１時間後の混合ガス中の水素の含有割合をガスクロマトグラフィーにより求めた。混合ガス中の水素の含有割合は、アルゴンと水素の混合ガス中の水素の含有割合を意味する。 Subsequently, the slurry in the petri dish 21 was irradiated with ultraviolet rays through the lid 23 made of quartz glass. By irradiating the slurry with ultraviolet light, water decomposition occurs and hydrogen is generated. This state was continued for 1 hour, and the hydrogen content in the mixed gas after 1 hour was determined by gas chromatography. The content ratio of hydrogen in the mixed gas means the content ratio of hydrogen in the mixed gas of argon and hydrogen.

なお、紫外線の照射源として、２００Ｗの水銀キセノンランプを用いた。この水銀キセノンランプは、４ｃｍ□の範囲に均一に紫外線を照射することができるので、平面視で直径が３ｃｍの円形のシャーレ２１の全体に紫外線を照射することが可能である。 Note that a 200 W mercury xenon lamp was used as the ultraviolet irradiation source. This mercury-xenon lamp can uniformly irradiate ultraviolet rays over an area of 4 cm square, so it is possible to irradiate the entire circular petri dish 21 with a diameter of 3 cm in plan view.

ここでは、光触媒の助触媒であるＣｒＮｉ酸化物の、ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）を変えたときの水素の発生量を調べた。ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）と、混合ガス中の水素の割合との関係を表１に示す。また、ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）を横軸に、混合ガス中の水素の含有割合を縦軸にとったグラフを図３に示す。 Here, the amount of hydrogen generated when the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni of CrNi oxide, which is a promoter of the photocatalyst, was changed was investigated. Table 1 shows the relationship between the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni and the proportion of hydrogen in the mixed gas. Further, FIG. 3 shows a graph in which the horizontal axis represents the ratio of the molar amount of Cr to the total molar amount of Cr and Ni (Cr/(Cr+Ni)), and the vertical axis represents the hydrogen content in the mixed gas.

Figure 0007435369000001
Figure 0007435369000001

図３に示すように、ＣｒＮｉ酸化物に含まれるＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．４以上１．０未満の場合に、水素が発生した。すなわち、ＴｉＯ2に、ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．４以上１．０未満であるＣｒＮｉ酸化物を助触媒として担持させた第１の実施形態における光触媒１０は、触媒活性が高く、水の分解により発生する水素の量が多い。 As shown in FIG. 3, hydrogen was generated when the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni contained in the CrNi oxide was 0.4 or more and less than 1.0. That is , a first implementation in which a CrNi oxide having a ratio of the molar amount of Cr to the total molar amount of Cr and Ni (Cr/(Cr+Ni)) of 0.4 or more and less than 1.0 is supported on TiO 2 as a promoter. The photocatalyst 10 in this embodiment has high catalytic activity and generates a large amount of hydrogen by decomposing water.

また、図３に示すように、ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）を０から少しずつ増加させていった場合、０．６以上になると、混合ガス中の水素の含有割合が急激に増加する。表１に示すように、ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．６以上１．０未満の範囲では、混合ガス中の水素の割合が０．０００４％以上と高くなった。したがって、第１の実施形態における光触媒１０は、上記モル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．６以上１．０未満であることが好ましい。 Furthermore, as shown in Figure 3, when the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni is gradually increased from 0, when it becomes 0.6 or more, The hydrogen content of the hydrogen increases rapidly. As shown in Table 1, when the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni is 0.6 or more and less than 1.0, the proportion of hydrogen in the mixed gas is 0.0004. % or more. Therefore, in the photocatalyst 10 according to the first embodiment, the molar ratio Cr/(Cr+Ni) is preferably 0.6 or more and less than 1.0.

また、表１および図３に示すように、上記モル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．７以上０．９以下の場合には、混合ガス中の水素の割合が０．００１５％以上とさらに高くなった。したがって、第１の実施形態における光触媒１０は、上記モル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．７以上０．９以下であることがより好ましい。 Further, as shown in Table 1 and FIG. 3, when the molar ratio Cr/(Cr+Ni) is 0.7 or more and 0.9 or less, the proportion of hydrogen in the mixed gas is 0.0015% or more. It got even higher. Therefore, in the photocatalyst 10 in the first embodiment, the molar ratio Cr/(Cr+Ni) is more preferably 0.7 or more and 0.9 or less.

＜第２の実施形態＞
図４は、第２の実施形態における光触媒４０の構造を模式的に示す図である。第２の実施形態における光触媒４０は、ＢａＴｉ4Ｏ9を含む粒子４１に、ＣｒＮｉ酸化物４２が担持された構造を有する。 <Second embodiment>
FIG. 4 is a diagram schematically showing the structure of a photocatalyst 40 in the second embodiment. The photocatalyst 40 in the second embodiment has a structure in which CrNi oxide 42 is supported on particles 41 containing BaTi 4 O 9 .

チタン酸化物であるＢａＴｉ4Ｏ9を含む粒子４１は、ＢａＴｉ4Ｏ9を主成分として含む粒子であって、例えば、ＢａＴｉ4Ｏ9からなる粒子である。なお、ＢａＴｉ4Ｏ9を主成分として含むとは、５０％以上の成分がＢａＴｉ4Ｏ9であることを意味し、ＢａＴｉ4Ｏ9以外の成分が含まれていてもよい。また、ＢａＴｉ4Ｏ9を含む粒子４１に、ＢａＴｉ4Ｏ9とは異なる組成比のチタン酸バリウムが含まれていてもよい。 The particles 41 containing BaTi 4 O 9 , which is a titanium oxide, are particles containing BaTi 4 O 9 as a main component, and are, for example, particles made of BaTi 4 O 9 . Note that "containing BaTi 4 O 9 as a main component" means that 50% or more of the component is BaTi 4 O 9 , and components other than BaTi 4 O 9 may be included. Further, the particles 41 containing BaTi 4 O 9 may contain barium titanate in a composition ratio different from that of BaTi 4 O 9 .

（実施例２）
ＢａＣＯ3とＴｉＯ2の原料粉を、ＢａＣＯ3：ＴｉＯ2＝１：４のモル比で配合し、水とジルコニアビーズとともにポットミルの中に入れて５時間混合して乾燥させた後、大気中１１００℃で熱処理することによって、ＢａＴｉ4Ｏ9の粉体を得た。 (Example 2)
Raw material powders of BaCO 3 and TiO 2 were blended at a molar ratio of BaCO 3 :TiO 2 = 1:4, placed in a pot mill with water and zirconia beads, mixed for 5 hours, dried, and then heated at 1100 °C in the air. A BaTi 4 O 9 powder was obtained by heat treatment at °C.

続いて、硝酸Ｎｉ水溶液および硝酸Ｃｒ水溶液を所望の組成比および量で配合した水溶液に、ＢａＴｉ4Ｏ9の粉体を浸漬して攪拌した後、１５０℃に設定したホットプレートで加熱して乾燥物を得た。その後、乾燥物を、大気中５００℃で熱処理することによって硝酸を揮発させてＣｒＮｉ酸化物を結晶化させることにより、ＢａＴｉ4Ｏ9に、助触媒であるＣｒＮｉ酸化物が担持された光触媒の粉体を作製した。 Next, the BaTi 4 O 9 powder was immersed and stirred in an aqueous solution containing a Ni nitrate aqueous solution and a Cr nitrate aqueous solution in the desired composition ratio and amount, and then heated and dried on a hot plate set at 150°C. I got something. Thereafter, the dried product is heat-treated in the atmosphere at 500°C to volatilize the nitric acid and crystallize the CrNi oxide, thereby producing a photocatalyst powder in which CrNi oxide, which is a co-catalyst, is supported on BaTi 4 O 9 . The body was created.

作製した実施例２の光触媒の活性を、実施例１の光触媒の活性を評価した方法と同じ方法で評価した。実施例２の光触媒のＣｒＮｉ酸化物に含まれるＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）と、混合ガス中の水素の割合との関係を表２に示す。また、ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）を横軸に、混合ガス中の水素の含有割合を縦軸にとったグラフを図５に示す。 The activity of the produced photocatalyst of Example 2 was evaluated by the same method as that of the photocatalyst of Example 1. Table 2 shows the relationship between the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni contained in the CrNi oxide of the photocatalyst of Example 2 and the proportion of hydrogen in the mixed gas. Further, FIG. 5 shows a graph in which the horizontal axis represents the ratio of the molar amount of Cr to the total molar amount of Cr and Ni (Cr/(Cr+Ni)), and the vertical axis represents the content ratio of hydrogen in the mixed gas.

Figure 0007435369000002
Figure 0007435369000002

図５に示すように、実施例２の光触媒は、助触媒であるＣｒＮｉ酸化物に含まれるＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）に関わらず、水素が発生した。すなわち、ＢａＴｉ4Ｏ9を含む粒子にＣｒＮｉ酸化物が担持されている実施例２の光触媒は、触媒活性が高く、水の分解により発生する水素の量が多い。 As shown in FIG. 5, the photocatalyst of Example 2 generates hydrogen regardless of the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni contained in the CrNi oxide that is the promoter. did. That is, the photocatalyst of Example 2 in which CrNi oxide is supported on particles containing BaTi 4 O 9 has high catalytic activity and generates a large amount of hydrogen by decomposing water.

また、図５に示すように、ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）を０から少しずつ増加させていった場合、０．６以上になると、混合ガス中の水素の含有割合が急激に増加する。表２に示すように、ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．６以上１．０未満の範囲では、混合ガス中の水素の割合が０．０１２％以上と高くなった。したがって、実施例２の光触媒は、ＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．６以上１．０未満であることが好ましい。 Furthermore, as shown in Fig. 5, when the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni is gradually increased from 0, when it becomes 0.6 or more, The hydrogen content of the hydrogen increases rapidly. As shown in Table 2, when the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni is 0.6 or more and less than 1.0, the proportion of hydrogen in the mixed gas is 0.012. % or more. Therefore, in the photocatalyst of Example 2, the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni is preferably 0.6 or more and less than 1.0.

また、表２および図５に示すように、上記モル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．７以上０．９以下の範囲の場合には、混合ガス中の水素の割合が０．０２０％以上とさらに高くなった。したがって、第２の実施形態における光触媒は、上記モル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）が０．７以上０．９以下であることが好ましい。 Further, as shown in Table 2 and FIG. 5, when the molar ratio Cr/(Cr+Ni) is in the range of 0.7 or more and 0.9 or less, the proportion of hydrogen in the mixed gas is 0.020%. It got even higher than that. Therefore, in the photocatalyst according to the second embodiment, the molar ratio Cr/(Cr+Ni) is preferably 0.7 or more and 0.9 or less.

本発明は、上記実施形態に限定されるものではなく、本発明の範囲内において、種々の応用、変形を加えることが可能である。 The present invention is not limited to the above embodiments, and various applications and modifications can be made within the scope of the present invention.

１０ 光触媒
１１ ＴｉＯ2を含む粒子
１２ ＣｒＮｉ酸化物
２１ シャーレ
２２ 密封容器
２３ 蓋
２４ パック
２５ 送風ポンプ
４０ 光触媒
４１ ＢａＴｉ4Ｏ9を含む粒子
４２ ＣｒＮｉ酸化物 10 Photocatalyst 11 Particles containing TiO 2 12 CrNi oxide 21 Petri dish 22 Sealed container 23 Lid 24 Pack 25 Air pump 40 Photocatalyst 41 Particles containing BaTi 4 O 9 42 CrNi oxide

Claims (6)

ＴｉＯ2を含む粒子にＣｒＮｉ酸化物が担持されており、
前記ＣｒＮｉ酸化物に含まれるＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）は、０．４以上１．０未満であり、
前記ＣｒＮｉ酸化物は結晶質であることを特徴とする光触媒。 CrNi oxide is supported on particles containing TiO 2 ,
The ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni contained in the CrNi oxide is 0.4 or more and less than 1.0,
A photocatalyst , wherein the CrNi oxide is crystalline . 前記モル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）は、０．６以上１．０未満であることを特徴とする請求項１に記載の光触媒。 The photocatalyst according to claim 1, wherein the molar ratio Cr/(Cr+Ni) is 0.6 or more and less than 1.0. 前記モル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）は、０．７以上０．９以下であることを特徴とする請求項２に記載の光触媒。 The photocatalyst according to claim 2, wherein the molar ratio Cr/(Cr+Ni) is 0.7 or more and 0.9 or less. ＢａＴｉ4Ｏ9を含む粒子にＣｒＮｉ酸化物が担持されており、
前記ＣｒＮｉ酸化物は結晶質であることを特徴とする光触媒。 CrNi oxide is supported on particles containing BaTi 4 O 9 ,
A photocatalyst , wherein the CrNi oxide is crystalline . 前記ＣｒＮｉ酸化物に含まれるＣｒとＮｉの合計モル量に対するＣｒのモル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）は、０．６以上１．０未満であることを特徴とする請求項４に記載の光触媒。 The photocatalyst according to claim 4, wherein the ratio Cr/(Cr+Ni) of the molar amount of Cr to the total molar amount of Cr and Ni contained in the CrNi oxide is 0.6 or more and less than 1.0. . 前記モル量の比Ｃｒ／（Ｃｒ＋Ｎｉ）は、０．７以上０．９以下であることを特徴とする請求項５に記載の光触媒。 The photocatalyst according to claim 5, wherein the molar ratio Cr/(Cr+Ni) is 0.7 or more and 0.9 or less.
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JP2007185605A (en) 2006-01-13 2007-07-26 Univ Of Tokyo Cocatalyst for photocatalyst and photocatalyst material
WO2010087445A1 (en) 2009-02-02 2010-08-05 パイオニア株式会社 TiO2 NANOPARTICLES
JP2014000502A (en) 2012-06-15 2014-01-09 Mitsubishi Chemical Holdings Corp Photocatalyst for water decomposition
JP2015112509A (en) 2013-12-09 2015-06-22 国立大学法人 東京大学 Photocatalyst, electrode for water-splitting reaction, and production method of hydrogen and/or oxygen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007185605A (en) 2006-01-13 2007-07-26 Univ Of Tokyo Cocatalyst for photocatalyst and photocatalyst material
WO2010087445A1 (en) 2009-02-02 2010-08-05 パイオニア株式会社 TiO2 NANOPARTICLES
US20120083409A1 (en) 2009-02-02 2012-04-05 National Institute For Materials Science Tio2 nanoparticles
JP2014000502A (en) 2012-06-15 2014-01-09 Mitsubishi Chemical Holdings Corp Photocatalyst for water decomposition
JP2015112509A (en) 2013-12-09 2015-06-22 国立大学法人 東京大学 Photocatalyst, electrode for water-splitting reaction, and production method of hydrogen and/or oxygen

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