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(a) Operando MS data collected in conjunction with UV Raman spectra during methanol conversion in the 100–250 °C range (m/z = mass-to-charge ratio). (b) Raman spectrum of calcined H-SSZ-13 catalyst activated at 600 °C in 20% oxygen (dark red line) and with methanol adsorbed at 100 °C (blue line). (c,d) Raman spectra collected in the temperature range from 100–150 and 150–220 °C during MTH reaction.
