ce-zsm-11 zeolite: an efficient heterogeneous catalyst for one pot synthesis of 4h-pyran derivatives

Zsm-11 zeolite was synthesized by hydrothermal treatment and cerium ion was incorporated by the ion exchange method. the catalytic activity of cerium modified zsm-11 zeolite was tested for the one pot synthesis of 4h-pyran derivatives by cyclocondensation of aromatic aldehyde, malononitrile and ethyl acetoacetate. the synthesized catalyst was characterized by powder-x ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, fourier transform infrared spectroscopy, brunauer-emmer-teller surface area analysis and temperature programmed desorption (ammonia) analysis. the present method offers significant advantages over the reported methods like easy separation of catalyst, simple work-up procedure, excellent yield of desired products and reusability of catalyst without significant loose in activity.