《Table 1 Mineral compositions of the extracted silica from RHA determined by XRF analysis w, 》

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《Rice Husk Ash:A New Silicon Source for Preparing SAPO-34 Catalysts Used in the Methanol-to-Olefins Reaction》

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The chemical composition of samples obtained by ICP-OES analysis is presented in Table 3.It can be found that in samples prepared from RHA，the Si/（Si+Al+P）ratio is very close to that of the silicon gels，and this value is slightly lower in the RHA-SAPO-34 sample.Although the amount of silicon incorporated into the network is similar in SAPO-34 and RHA-SAPO-34，the different proportion of phosphorus and aluminum in the solid samples suggests that the silicon distribution in the framework is rather different in both samples.