Supported gamma-alumina layer

Despite the above-mentioned advantages of cerium oxide and a-alumina especially for the conversion of alcohols, a wide variety of investigations have dealt with alkene conversion on y-alumina-supported active species [16, 28, 41]. For sol-gel layers, which can also be used as a support for CPO [8], the determination of the aluminum phase is often not reported (e.g. [42]) as calcination temperatures between 300 and 700 °C could result in a considerable contribution of amorphous phases to gamma phases and at 800-1000 °C there is an additional transition to a delta phase [43]. 

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