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采用溶胶 凝胶法和超临界干燥 (SCD)技术制备了超细二元NiO Al2 O3和三元NiO La2 O3 Al2 O3催化剂 ,并以浸渍超细氧化铝载体和普通氧化铝载体制得的二元和三元催化剂为对比 ,考察了不同制备方法对催化剂上CH4 CO2 重整反应性能的影响 .结果表明 ,超细催化剂表现出很高的高温催化活性、选择性和显著的抗积碳能力 ,即使不含助剂的超细二元催化剂也明显优于含镧助剂的负载三元催化剂 ,而含镧的超细三元催化剂又好于超细二元催化剂 ,显示了溶胶 凝胶法和SCD制备技术的优越性 .重整反应气氛下催化剂的活性表面是可变和可恢复的 ,而高活性、高选择性及高抗积碳能力与合理的产品分布是一致的 .
Ultrafine binary NiO Al 2 O 3 and ternary NiO La 2 O 3 Al 2 O 3 catalysts were prepared by sol-gel method and supercritical drying (SCD) technology. The binary catalysts were prepared by impregnating ultrafine alumina carrier and common alumina carrier Compared with the ternary catalyst, the effects of different preparation methods on the reforming reaction of CH4 CO2 on the catalyst were investigated. The results show that the ultrafine catalyst exhibits high catalytic activity at high temperature, selectivity and significant anti-carbon deposition ability Ultrafine binary catalyst without additives is also significantly better than the supported three-way catalyst containing lanthanum-containing catalyst, while the ultrafine three-way catalyst containing lanthanum and ultra-fine binary catalyst, showing the sol-gel method and SCD The superiority of the preparation technique The active surface of the catalyst in the reforming reaction atmosphere is variable and recoverable while the high activity, high selectivity and high resistance to carbon deposition are consistent with reasonable product distribution.