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Selective Catalytic Reduction (SCR) of NO using reductants such as urea continues to be of high interest to meet impending regulations. Vanadia supported on anatase titania is a well-established catalyst for stationary and heavy-duty-diesel truck deNO applications. However, traditional anatase titania-based materials are regarded to have limited thermal stability in the most demanding applications such as those where the SCR catalyst is located downstream of a regenerating DPF, in which the catalyst could be exposed to very high temperatures. More recently, state-of-the-art titania-based vanadia catalysts have shown good cold-start performance and are capable of surviving accelerated aging treatments of up to 64 hrs at 670°C, good performance in a configuration upstream of a DOC/DPF, good low temperature NO conversion on par with Cu-zeolite SCR catalysts and superior resistance to sulfur poisoning.