沈殿法によるリン酸アルミニウム触媒の調製とその n-ブタノール脱水反応活性

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  • チンデンホウ ニヨル リンサン アルミニウム ショクバイ ノ チョウセイ ト
  • Preparation of Aluminum Phosphate by Precipitation Method and its Catalytic Activity in ｎ-Butanol Dehydration

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The circumstances in the preparation of aluminum phosphate catalyst which control the properties of the catalyst have been investigated for the phosphate prepared from a solution　of aluminum salt and phosphoric acid by addition of ammonia. Surface area, acidity, and catalytic activity have been used to characterize the catalyst. The rate of addition of ammonia, final pH, washing of precipitate, temperature of heat-treatment, and kind of aluminum salt were found to affect the nature of the resulting catalyst. Aluminum　phosphates　obtained　from　nitrate and chloride（N-　and　C-AIphosphate） had higher total acid amounts and larger surface areas than aluminum phosphate obtained from sulfate（S-AI-phosphate）, but the latter showed higher catalytic activity than the former.　The former catalyzed the dehydration of n-butanol to form ether rather than olefin, while the latter catalyzed selectively to form olefin. For the Former, the 1-butene content and the ratio of cis- to trans-2-butene were higher than the equilibrium values； whereas for the latter, there was a clear trend toward a decrease in 1-butene and an increase in the 2-butene isomers as the conversion increased. The effects of final pH and washing were remarkable for S-AI-phosphate.

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