载体焙烧温度对Ni/Al_(2)O_(3)催化剂辛烯醛加氢性能的影响  

Effect of support calcination temperature on the performance of Ni/Al_(2)O_(3) catalyst for octenal hydrogenation

作　　者：牛慧江 鲁树亮[1] 王国清[1] Niu Huijiang;Lu Shuliang;Wang Guoqing(Sinopec Beijing Research Institute of Chemical Industry,Beijing 100013,China)

机构地区：[1]中国石化北京化工研究院,北京100013

出　　处：《石油化工》2021年第10期999-1003,共5页Petrochemical Technology

基　　金：中国石油化工股份有限公司资助项目(11-19ZS0420)。

摘　　要：制备了不同晶相的球形Al_(2)O_(3)负载的Ni金属催化剂,采用XRD、N_(2)吸脱-脱附、H_(2)-TPR、H_(2)脉冲化学吸附等方法对载体和催化剂进行了表征,并在高压釜中考察了催化剂的辛烯醛催化加氢性能。表征结果显示,随载体焙烧温度的升高,Al_(2)O_(3)载体的晶型从γ相逐渐转变为θ相,平均孔径增大,孔体积和比表面积减小;催化剂的H_(2)吸附量和金属分散度先增大后减小;催化剂还原峰的顶点温度集中在500~560℃之间。催化剂评价结果表明,随载体焙烧温度的升高,催化剂的活性先增大后有略微降低。载体焙烧温度影响催化剂活性主要是因为焙烧温度影响载体的晶相和催化剂的孔结构。Ni catalysts supported on spherical Al_(2)O_(3) with different crystal phases were prepared,and the supports and catalysts were characterized by XRD,N_(2) adsorption-desorption,H_(2)-TPR and H_(2) pulse chemisorption.The catalytic performance of the catalyst in the hydrogenation reaction of octenal aldehyde was investigated in an autoclave.The characterization results showed that with the increase of the calcination temperature of the support,the crystal form of the Al_(2)O_(3) support gradually changed fromγphase toθphase,the average pore size of the support increased,and the pore volume and specific surface area decreased.The amount of H_(2) chemisorption and metal dispersion of the catalyst increased first and then decreased.The apex temperature of the catalyst reduction peak was concentrated between 500℃and 560℃.The catalyst evaluation results showed that with the increase of the support calcination temperature,the activity of the catalyst first increased and then slightly decreased.The effect of calcination temperature on the catalyst activity was mainly due to the influence of calcination temperature on the crystal phase of the support and the pore structure of the catalyst.

关 键 词：氧化铝 焙烧温度 辛烯醛液相加氢 镍催化剂 

分 类 号：TQ426[化学工程]