Promoter effect of alkali metal oxides and alkali earth metal oxides on active carbon-supported ruthenium catalyst for ammonia synthesis.
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概要
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Promoter effects of alkali metal nitrates and alkali earth metal nitrates on Ru/A.C. (active carbon) were studied in order to prepare an effective catalyst for ammonia synthesis. Of alkali metal nitrates, RbNO<SUB>3</SUB> was more effective than C<I><SUB>s</SUB></I>NO<SUB>3</SUB> and KNO<SUB>3</SUB>. Alkali earth metal (Mg, Ca, Sr, Ba) nitrates were also found to be effective promoters on Ru/A.C. catalysts. Of them heavier alkali earth metal elements were more effective (Ba>Sr>Ca>Mg). Ba(NO<SUB>3</SUB>)<SUB>2</SUB> was as effective as CSNO<SUB>3</SUB>, which was not expected from the stand point of electronegativity. The transformation of promoter precursors to active compounds (nitrates to oxides or hydroxides) and the interaction of promoters and ruthenium were discussed. Precursor of ruthenium salt was also studied. RuCl<SUB>3</SUB>·3H<SUB>2</SUB>O and [Ru(NH<SUB>3</SUB>)<SUB>6</SUB>]Cl<SUB>3</SUB> gave higher activities than Ru<SUB>3</SUB>(CO)<SUB>12</SUB>. It was discussed that RuCl<SUB>3</SUB> gave finer Ru particles than Ru<SUB>3</SUB>(CO)<SUB>12</SUB> on active carbon. The turn over frequency (TOF) of Ru–Rb<SUP>+</SUP>/A.C. was lower than those of RU–Cs<SUP>+</SUP>/Al<SUB>2</SUB>O<SUB>3</SUB> and of Ru–Cs<SUP>+</SUP>/MgO.
- 公益社団法人 日本化学会の論文
著者
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Onishi Takaharu
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Aika Ken-ichi
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Kawahara Toshikazu
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Murata Shuzo
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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