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在一些特定条件下,以水蒸气和氮气或空气的混合气体处理硅藻土制备了高强度大孔的烯烃水合磷酸催化剂的载体。提出了水蒸气处理过程的反应机理,认为在蒸气处理过程中,由于磷酸的催化作用,硅藻壳表面的脱水硅凝胶发生了解聚溶解并进一步聚合,形成了一层硅胶薄膜覆盖在硅藻壳骨架上,在某些位置通过Si—O—Si桥将硅藻壳相互连接,在此过程中还存在着反应产物的气相迁移作用,因而可改变载体的孔结构。
Under some specific conditions, the support of high strength macroporous olefin hydrated phosphoric acid catalyst was prepared by treating diatomaceous earth with a mixture of steam and nitrogen or air. The reaction mechanism of water vapor treatment process is proposed. It is considered that the dehydration silicon gel on the surface of the frustules is depolymerized and further polymerized during the steam treatment due to the catalytic action of phosphoric acid, forming a layer of silica gel film covering the diatoms Shell skeleton, in some places by Si-O-Si bridge to connect the frustules, in the process there is still the reaction product of the gas phase migration, which can change the pore structure of the carrier.